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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd9872713851c98dc1e27a8ebd2961ff777a26ca71b84619e3ae621bd85e7494' 
  AND token = 'uQksaS96Em6q92x3GtxZ4Hw//HsKl6WMpnPHiYbPMpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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