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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5ce174a20d1617c7836adb1490000dca901db95cd431516c31957f6b12f49a3' 
  AND token = '8f04bgYUhoklA0KGUCilQo7a4pyB77JgOyPUz77ebsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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