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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8e911f2bc3f4e2fadfd7342b6de10ad340ae9f8defd0d9a42c5b736458f2915' 
  AND token = 'Ft+wj8RKZRkpECdMfXuUutEqAlNRig5LbFzyUFf0fBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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