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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb6b1cba09d765db9fc736ec0cf7854fe66506ddb837cb547813f2298d1badbd' 
  AND token = 'ls/yPYE2TcCqeW4ZudC1feVGIRICQfpYPUM2CKLT3HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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