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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a0c3ebdcc28103a23d5064d2b6e620a22320c79a64364645be85b66f2413819' 
  AND token = '23cANDMhSk1BCe2unoF7Q9BnFKJWPkLBJJl92Z7Tm8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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