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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb323731b664cb6561ef5d6248fcbc501a22e17809fb2c6dfd9dada8916aeac7' 
  AND token = 'N/08/LiCfiVCoiv6rl38pnbtLXM20Txx1gLzej8n35Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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