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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0434ed1aa29f2c1b5d5e67dac6abb1532f7b004d011d761ae04d59e8ae086a6a' 
  AND token = 'PgLTcZuwDKTXArj8DKB8rUS+vAAqgC6fDmHdp0OBnFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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