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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb39ead740c686dbbc4df3126690d799107d804130d0e4049ec14e3c39f727fd' 
  AND token = '/YoetH16tVY0Ooczd/1jnz0nEkvTu9Sm0W1tZUqwIKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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