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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c824c1269d440b59170fbe1d960042837b4f2e93acecd70c3032a22bb98b89ea' 
  AND token = 'LOZ2snizIq2gajbPldbR9tgxmiZMx57nsfSgx+fgJFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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