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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35cdfecc4dd5e3b8e9f0761f6bf9e85f645e10e48cb1b33ac875a50bc745a5ec' 
  AND token = '3hJRdKFCQbOIJ/fAxJxoxDsmsXb9eTLfaA3tl8FjimE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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