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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f3eefed0b042420581d866ef6c25bdb413016fa8590e04cee25b0f34a399624' 
  AND token = 'Q7+0AZ3XJzUVHb1e0oxi0Cf0QgPA+ANDNEwsFHRQOng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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