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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cffd0192e2d1836f8eef1292411c2125415834d331fd2715664637ccd3302a7c' 
  AND token = 'pTD2E+gPmhIq5X30wk+kx2Fu7f1voRNU98IPIbmE5P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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