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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9afabbea0cd5e3ef04f716ed2b7be13224d980dd8bd7b32c97b5b455de527ed0' 
  AND token = 'tPpN2imDrAEGH1yLughRL4sTx9tM3KY5mDwWQam1TMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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