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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49b2dd50583025431516587ab01da33a7d0800f50224abbb1115c3f8485d4ea8' 
  AND token = 'zldCX8qHEzdMJX0bblPhn0KKIs5IAS+FrEA+eP++HA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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