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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f49842497c94d5ed6daaed6bd8d09a9a397c3f72b3c8d4fd7bfbb16ed845aec' 
  AND token = 'tmc+Tp0qxYy4GvnMxQGyS5bwF4z/K1beosChnnCwNAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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