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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfd65f02e17430729f1a8f168d210aba109620b72ffcf3f996033ba98a21c8a4' 
  AND token = '/tfaEHeBLj9VpsZreNHAg1Dz8nQygzzrYMPqCermC4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}