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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fce3b435f14d9c1e77b5cf032a5050396d3fad757169e26c62d759f3c4564e3e' 
  AND token = 'PByjONhHvhTCk5VJQNBLZhv5i36eSmMxBq7QT2VrD6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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