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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cc5d6e512922d6620b213a55302a7e5dda0fbd0c22daa7d0cec48237c2ab996' 
  AND token = 'q8pwdyFDQkMBqszr0kGFdifwarhSXtM9hJenMP1naIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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