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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4ab1d91053a50a5cba7ad6690d6893906d9f10c7d472eced9d2d264000a5387' 
  AND token = 'l1Ed4+t7/3Gp4SnS9h3KLRCH8JA4tS6Mp+9JCwcEZWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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