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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '247842b440109ef5b7361bfd9456601a6b62a45a8f528bd1d8f5d14376663f74' 
  AND token = 'WuI/oDuW+6e4boh3xL4eqpCpRLzk8lNQLpf5cTIpx9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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