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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d6895065d461ca3c20749db621415f1e8834d2eeaa4c08c584e802671403a0a' 
  AND token = 'f6lCrYddVdH+Ylm0yQVbXC1IuF/q2Cnk7ASKe9h1wMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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