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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88147280db89bc564d88dba454b7a7e7ddb2a7f6802b53ba748a4aa0c708c1e0' 
  AND token = 'yKCGxC8InY96/hwtVy4no+YBpfQ8XrN0M4yMGs+/258=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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