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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34b0a11535bc90b5a9568284410ce9faa58263da4a364e0aba332a6cf7b9c92c' 
  AND token = 'ceypn9Zz/huHV1mQbc0TQF2kQ1Rh8bWSyJgcxWLb8Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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