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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6057911da1c3290d6e3e4bf1e21c5094a1473792e93430a4e66b025c6708c12a' 
  AND token = 'oABin8wB3Lv5NMbmPTnvaA8btWyrtbN5BfA7BgPaEig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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