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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4db2ac9b574bf10adf0a95ebb2bebffb49ced11ad36b09adc273dfa8323b68e8' 
  AND token = 'ZlQUDd6KwVRKdFEQ44a1XCpC3GHBcZVHNYsF6Lryp40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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