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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9afb8c8ecc5983e5c281d7828ca5191bffd36d472a474ed68efcee9a265c1f03' 
  AND token = 'x4p5ra37IHBOnyHscl0t0STraUmuqUfKz0ck2zix0PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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