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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8befd0938bce3e847bce73ef505dc578cda22c956d45f71f6fbd9bdcaa4ecab' 
  AND token = 'WaMHLG5bzG+1+svWxpvI62yKqF0La30n8atWSofuzvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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