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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa0bcb18834641dd3e0c9acc2d5161297e7db5309ae054fb5304f12783a9dc81' 
  AND token = 'gCpMspdKUVNZoQQKHgliHb1tNbFTfxcX0Jqlcqg6uOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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