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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa5e3d76fcf502bee8c8a12765bb1f9ab36bd5f690719d5cdbd796e7d3a4dc72' 
  AND token = 'ZL4+9WaEqt1QWuv+7YE/bCbDEfl7aBga9cL1bAm1D3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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