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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c716f478e12b72313765a00ef562e7d2efe0fa81062b3461b671557b289723c' 
  AND token = 'PSpLpvk06vWRZHxyihXRGIXPw7lu8W4vlAQD3gNB6C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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