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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0253012b6f2c78063dc5b9474169617b8c227d3d7c667386b521f7f7d6b16332' 
  AND token = 'DxUg9knrTyi/pCuRpQviMdZexDP18NPQegg1Ks/aSQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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