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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccd91f7d148f52dfd899a600e0195fdc133d6dd80f661f94a116a47f37212569' 
  AND token = 'Q533QWE38do84OWORrAAbACe2UAzKr+wZ6ry7hxa1BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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