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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9505231226c3e3c858053e3efc56303b0b65aecd04675adfed89501d13c41ded' 
  AND token = '6Y1lToKX1AgtNnwo/79NC3CZGVLqHi3/1Brg2lMwUcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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