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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '750c2b9e01f8732b816174dec45ede0bf3d4b3fa39253a3b0a8439a46e62bc75' 
  AND token = 'MUFkbkaHItfnyX6wG1NeKpggC1XIfY4AGfNRUHE6EK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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