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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e78f6f39c92c6f945c5e9bd1ac6172d57277f27869a5ef0da33209c6261587f1' 
  AND token = 'y0VeTtpg0tGKFEsOPZhvYd1sdNyQeQgq38GbySl/5lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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