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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e786d291cca411ff91cb8edda513913b133d6077710d9fc11ec42bd86fd20d36' 
  AND token = 'TisSOuXwIRIHdEdOi9PAUDzaG/aPi4tV9eMljH9RmKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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