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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec5ec2209a3a95653833abb0de9d314abe2cc04da4e2cbee70c6ad5fbed387ec' 
  AND token = '0ALsY12nMup1B2V399ZLelQxo70r66tW3v1lgvCS+/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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