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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7f791cb98c40cdf914d9664f971c9ca2b9627086ddb97c91e0aec5f31e1e68a' 
  AND token = '/o9Q/DFEjO8ErODt1uFs4KGIkV8i80m3/xahMfLjua0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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