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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f07bf56ad52554b067538c760a1adaecb71d65e151028ebceda7e000ce72601c' 
  AND token = 'oIrd6M2yAwLnGl6jvDb+jOLhDtLlIfn1B/5+S033HRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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