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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '864b1b5d8890ede6d4b82e27b4739882dd19d5776d414df34e7f9343f3711503' 
  AND token = '+lDeDSAqf+x8NPT3nm9TZibojjdtpUNmXkncbCZxixE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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