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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5dba634bc4e0e78d3730e4510722927650aa6d545e66928716278af6273f4d56' 
  AND token = 'HMN/MFIDEAOMm5nv3gUVr9O9DAKi6J7iJjvD8U4HXa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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