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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae72b490863391850b11c05d61c1fe18da4f92d834415bc44a4bec6e4d96d09a' 
  AND token = 'BEc8OcSFP4lqNJgtjtCG0jmG5APewHDOUmTeqjhWV9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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