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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe64a0a3475e9d739003b7bff5bcaa7802c3b9d1671a3317a4d21710d6e3101c' 
  AND token = 'sNa7YiElf5xYnGnYB1gL3cjDJcJovny1FII8s8RDmNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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