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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b25d8d680f41cc2ff0fb3fbb9218e9c77ee732801d372fb4147c90bf298ebc8' 
  AND token = 'rqc73jMBh9sUUf4i5d+vO2A96BjhlWfxyZr+d+fSals=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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