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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94a589278e434e7e0faf144af831d60c3d2dd11a9e7ee32d3eef31fae589ec11' 
  AND token = 'pASmcPJsseBPIQvdpBxHmjju2CkrzyBNST8bkFHT77o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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