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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c78f50003c402fb8c413a9bf87cf3cdff3dbc610fadd302d0968941657eb174' 
  AND token = 'ett1QTHi6UKuhz+f9Ws9Vt9pR3FcRKB4xf3LkdwrHsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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