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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2531ab6862536959604b68c1a33106f0975689b10986d7eba5f36985d58c8bf6' 
  AND token = 'H88HFEF0wl06IuvldPzQ13YZKUpYfs0OCwckhD7+lCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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