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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f01fd310320cdcfc6270a7e10a9b81f288be5323671332ec446ade89e5118fc3' 
  AND token = 'GFDRx1fjO3TwnDLni9//qD4pbFvjknyE2IS1XwTVN68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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