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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4185771717586dd6448d988f782e48ba2450e5f195c4081a00e62864447d0229' 
  AND token = '3NWcy5sYlPqY/BTNDKbs4cRTIri9aUFIJ57WdVT0kp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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